package com.atguigu;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @ClassName ThreadOrderAccess
 * @Author yy
 * @create 2022/9/7 20:22
 */


//线程间定制化调用通信
// Lock与synchronized的区别
// synchronized与wait,notify(notifyAll)一起
// Lock中的newCondition与awiat,signal(signalAll)一起用

/*
 * AA打印5次，BB打印10次，CC打印15次
 * 接着
 * AA打印5次，BB打印10次，CC打印15次
 * ......来10轮
 *
 * 1 线程 操作  资源类
 *
 * 2 判断 干活 通知
 *
 * 3 防止虚假唤醒
 *
 * 4 多线程的标志位变更
 */

class ShareResource{
    private int flag = 1; //1 A ,2 B, 3 C

    private Lock lock = new ReentrantLock();
    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();

    public void print5(){
        lock.lock();
        try {
            //1 判断
            while (flag != 1){
                condition1.await();
            }
            //2 干活
            for (int i = 1; i <= 5; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            flag = 2;
            //3 通知
            condition2.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void print10(){
        lock.lock();
        try {
            //1 判断
            while (flag != 2){
                condition2.await();
            }
            //2 干活
            for (int i = 1; i <= 10; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            flag = 3;
            //3 通知
            condition3.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void print15(){
        lock.lock();
        try {
            //1 判断
            while (flag != 3){
                condition3.await();
            }
            //2 干活
            for (int i = 1; i <= 15; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            flag = 1;
            //3 通知
            condition1.signal();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}

public class ThreadOrderAccess {
    public static void main(String[] args) {
        ShareResource shareResource = new ShareResource();

        new Thread(()->{ for (int i = 0; i < 10; i++) shareResource.print5();},"A").start();
        new Thread(()->{ for (int i = 0; i < 10; i++) shareResource.print10();},"B").start();
        new Thread(()->{ for (int i = 0; i < 10; i++) shareResource.print15();},"C").start();
    }
}
